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Fix default $oldOpts from 09cbebb224

Authored by aaron.

Description

Fix default $oldOpts from 09cbebb224

This fixes the default $oldOpts value for the case when
$opts is given check keys and no $oldOpts value is passed
in. In that case, the getWithSetCallback() method
variable $opts would be null instead of array().

Change-Id: I825062533478b37766511aae1d06dd4b81f8dba1